<?php
header("Content-type:text/html;charset=utf-8");
$phone=$_GET["phone"];
$conn = mysql_connect("localhost","root","root");
mysql_select_db("sign");
$requer=mysql_query("select * from sign1 where phone_num='$phone'",$conn);
if(mysql_num_rows($requer)==1)
{
	echo "当前用户名已经存在";
}


mysql_close($conn);
?>